PROFORM's new CS130 160 AMP Alternator, for Small Block Chevy 305-350 and Big Block Chevy 402-454 engines, is a 1-wire, GM CS130 Case Style, complete with Internal Regulator. The External Fan Style Alternator features a Machined Pulley, Chrome finish and is NOT made with re-man components. Each alternator is produced by highly-specialized machines, assembled by highly-trained personnel using dedicated jigs and equipment.